I have His 4850 and it looks like the BIOS is missing 1 (maybe more) of the
"power levels" there should be one ~160mhz and the corresponding (low) voltage,however the "lowest" "power level" is set to 500 and the not so low
voltage.

There are 2 BIOS files there 1 MSI (with correct power levels) the other one
is Powercolor with "messed" up "power levels"(like my his)

Right:

GPU Device Id: 0x1002 0x9442
113-B50102-Y06
Wekiva RV770 B50102 Board
(C) 1988-2005, ATI Technologies Inc.
ATOMBIOSBK-ATI VER011.004.000.000.000000
s3b50102.y06
Clock State 0
Core Clk: 625.00 MHz
Memory Clk: 993.00 MHz
Voltage: VID1
Flags: Boot
Clock State 1
Core Clk: 160.00 MHz
Memory Clk: 500.00 MHz
Voltage: 1.046 V
Flags:
Clock State 2
Core Clk: 625.00 MHz
Memory Clk: 993.00 MHz
Voltage: VID1
Flags:
Clock State 3
Core Clk: 625.00 MHz
Memory Clk: 993.00 MHz
Voltage: VID1
Flags:
************************************************** *****
Wrong:

GPU Device Id: 0x1002 0x9442
113-B50102-103
Wekiva RV770 B50102 Board
(C) 1988-2005, ATI Technologies Inc.
ATOMBIOSBK-ATI VER011.003.000.000.029117
B3B50102.103
Clock State 0
Core Clk: 625.00 MHz
Memory Clk: 993.00 MHz
Voltage: VID1
Flags: Boot
Clock State 1
Core Clk: 500.00 MHz
Memory Clk: 750.00 MHz
Voltage: 1.046 V
Flags:
Clock State 2
Core Clk: 625.00 MHz
Memory Clk: 993.00 MHz
Voltage: VID1
Flags:
Clock State 3
Core Clk: 500.00 MHz
Memory Clk: 993.00 MHz
Voltage: 1.084 V
Flags:

http://www.techpowerup.com/vgabios/i...ace=&memSize=0